Acoustic radiation force on a compressible cylinder in the standing surface acoustic wave (SSAW)

In this work, the radiation force exerted by the standing surface acoustic wave (SSAW) on a compressible cylinder in inviscid fluids is derived. The formula obtained in plane standing waves fails to calculate the radiation force on the cylinder in the SSAW. The Rayleigh angle is introduced to extend the prior formula. According to our expressions, the radiation force can not only repel the cylinder but also attract it in the direction perpendicular to the piezoelectric substrate. The Rayleigh angle can be used to actively tune the equilibrium positions (pressure nodes or antinodes) in the SSAW. Additionally, it can also be used to manipulate bubbles. Thus, our expressions have great potential in the SSAW-based applications. Published by AIP Publishing.